Corbyn was pictured next to a convicted terrorist as the Labour leader faces questions over a historic trip to Tunisia

Mr Corbyn’s spokesman said: "Jeremy has a long and principled record of solidarity with the Palestinian people and engaging with actors in the conflict to support peace and justice in the Middle East."

In the same group photo is the exiled leader of a banned Palestinian group that murdered a British rabbi.

In that memorial service the Labour leader was pictured next to Maher al-Taher, leader-in-exile of proscribed Palestinian terror organisation the Popular Front for the Liberation of Palestine, at the ceremony in Tunis in October 2014.

The Labour leader has since said he was "unaware" he was sharing a platform with a senior member of a terror group and told Channel 4 News that he laid his wreath “on the graves of all those that have died”, adding: “I’m not apologising for being there at all.”

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A spokesman for Mr Corbyn said: “Jeremy attended the conference convened by the president of Tunisia to support Palestinian rights and to bring together Palestinian factions to unite for a peaceful and just settlement of the Israel-Palestine conflict.

“He is, of course, completely opposed to attacks on civilians.”

The Campaign Against Anti-Semitism referred the case to the Parliamentary watchdog - meaning an inquiry into who paid for Mr Corbyn’s trip could be launched.

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